clandestine, secret or furtive
The backstairs (stairs at the rear of a building).
Private, exclusive; not public; one's own.
With knowledge of; party to; let in on.
An outdoor facility for urination and defecation, whether open (latrine) or enclosed (outhouse).
A partaker; one having an interest in an action, contract, etc. to which he is not himself a party.
A lavatory: a room with a toilet.
A toilet: a fixture used for urination and defecation.